package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {


    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.检验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.不符合，返回错误信息
            return Result.fail("手机号错误");
        }

        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);


        //4.保存验证码到Redis
        stringRedisTemplate.opsForValue().set(RedisConstants.LOGIN_CODE_KEY +phone,code,RedisConstants.LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.发送验证码
        log.debug("发送短信验证码成功，验证码:"+code);

        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.检验手机号
        String phone=loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.不符合，返回错误信息
            return Result.fail("手机号错误");
        }
        //3.校验验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(RedisConstants.LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if(cacheCode==null||!cacheCode.equals(code)){
            //4.不一致，报错
            return Result.fail("验证码错误");
        }
        //5.一致，根据手机号查询用户 select * from tb_user where phone = ?
        
        User user = query().eq("phone", phone).one();

        //6.判断用户是否存在
        if(user==null){
            //6.不存在，创建新用户并保存
            user=createUserWithPhone(phone);
        }

        //7.保存用户信息到Redis
        //7.1 随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString();
        //7.2 将user对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                .setIgnoreNullValue(true)
                .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        //7.3 存储
        String tokenKey=RedisConstants.LOGIN_USER_KEY+token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //7.4设置有效期
        stringRedisTemplate.expire(tokenKey,RedisConstants.LOGIN_USER_TTL,TimeUnit.MINUTES);
        //8.返回token
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key=RedisConstants.USER_SIGN_KEY+userId+keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //写入Redis SETBIT key offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);


        return Result.ok();
    }

    @Override
    public Result signCount() {
        //获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key=RedisConstants.USER_SIGN_KEY+userId+keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //获取本月到今天为止所有的签到记录 返回一个十进制数字
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if(result==null||result.isEmpty()){
            //没有任何结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num==null||num==0){
            return Result.ok(0);
        }
        int count=0;
        //循环遍历
        while(true){
            //让这个数字与1做与运算，得到最后一个比特位
            //判断比特位是否为0
            if((num & 1)==0){
                //为0,结束
                break;
            }
            else{
                //不为0，已签到 计数器+1
                count++;
            }
        //数字右移一位
        num>>>=1;


        }


        return Result.ok(count);
    }

    private User createUserWithPhone(String phone){
        //1.创建用户
        User user=new User();
        user.setPhone(phone);
        user.setNickName("user_"+RandomUtil.randomString(6));
        //2.保存用户
        save(user);
        return user;
    }
}
